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I'm guessing the Prometheus they mean is a time-series database. See: https://prometheus.io/

It's specifically a TSDB built for metrics and instrumentation. Basically intended to be Google's Borgmon for everybody else in the same way Kubernetes is essentially Borg for everybdoy else.

It is more than TSDB because it has dimensions. Most metric systems (aka Graphite) are just: <time> <name> <number> <maybe unit>.

It is sort of nice to have dimensions for rollup/filtering instead of doing weird name mangling like graphite does. For example one might add a dimension of build # or release version to each metric.

Having a dimension like build # you could even effectively say if your releases are improving performance wise and graph it. TBH haven't done it yet but I think it would be useful instead of just manually doing it with time filtering.

We do this with telegraf + influxdb. It has support for tags in measurements where we add the release version among other metadata which we can then visualize in grafana with a simple group by in the query.

You can also shove in multiple related metrics as part of the same measurement.

https://docs.influxdata.com/influxdb/v0.13/write_protocols/l...

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